nixos/home/modules/fish.nix

{ pkgs, inputs, ... }:
{
  programs.bash = {
    enable = true;
    initExtra = ''
      if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
      then
        shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
        exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
      fi
    '';
  };

  programs.fish = {
    enable = true;
    interactiveShellInit =
      builtins.readFile "${inputs.fish_theme}/fish_prompt.fish" + "\n" +
      builtins.readFile ../fish/config.fish
    ;
  };
}